AFM analysis of bleaching effects on dental enamel microtopography

作者：Pedreira de Freitas Ana Carolina; Espejo Luciana Cardoso; Botta Sergio Brossi; Teixeira Fernanda de Sa; Cerqueira Luz Maria Aparecida A; Garone Netto Narciso; Matos Adriana Bona^*; Barbosa da Silveira Salvadori Maria Cecilia

来源：Applied Surface Science, 2010, 256(9): 2915-2919.

DOI：10.1016/j.apsusc.2009.11.050

• Surface morphology analysis
• Dental enamel
• Atomic force microscopy
• Tooth bleaching
• Roughness parameters
• Power spectrum density

The purpose of this in vitro study was to test a new methodology to evaluate the effects of 35% hydrogen peroxide agent on the microtopography of sound enamel using an atomic force microscope (AFM). The buccal sound surfaces of three extracted human lower incisors were used, without polishing the surfaces to maintain them with natural morphology. These unpolished surfaces were subjected to bleaching procedure with 35% hydrogen peroxide that consisted of 4 applications of the bleaching agent on enamel surfaces for 10 min each application. Surface images were obtained in a 15 mu m x 15 mu m area using an AFM. The roughness (Ra and RMS) and the power spectral density (PSD) were obtained before and after the bleaching treatment. As results we could inquire that the PSD analyses were very suitable to identifying the morphological changes on the surfaces, while the Ra and RMS parameters were insufficient to represent the morphological alterations promoted by bleaching procedure on enamel. The morphological wavelength in the range of visible light spectrum(380-750 nm) was analyzed, showing a considerable increase of the PSD with the bleaching treatment.

• 出版日期2010-2-15